211210133021021 has 2 divisors, whose sum is σ = 211210133021022. Its totient is φ = 211210133021020.

The previous prime is 211210133020979. The next prime is 211210133021029. The reversal of 211210133021021 is 120120331012112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 123227871648025 + 87982261372996 = 11100805^2 + 9379886^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211210133021021 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 211210133020984 and 211210133021002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211210133021029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105605066510510 + 105605066510511.

It is an arithmetic number, because the mean of its divisors is an integer number (105605066510511).

Almost surely, 2^{211210133021021} is an apocalyptic number.

It is an amenable number.

211210133021021 is a deficient number, since it is larger than the sum of its proper divisors (1).

211210133021021 is an equidigital number, since it uses as much as digits as its factorization.

211210133021021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 211210133021021 its reverse (120120331012112), we get a palindrome (331330464033133).

The spelling of 211210133021021 in words is "two hundred eleven trillion, two hundred ten billion, one hundred thirty-three million, twenty-one thousand, twenty-one".